
/* 定义keyframe动画，命名为blink */
@keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 1; }
    50.01% { opacity: 0; } /* 注意这里定义50.01%立刻透明度为0，可以设置闪烁效果 */
    100% { opacity: 0; }
}

/* 添加兼容性前缀 */
@-webkit-keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 1; }
    50.01% { opacity: 0; }
    100% { opacity: 0; }
}
@-moz-keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 1; }
    50.01% { opacity: 0; }
    100% { opacity: 0; }
}
@-ms-keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 1; }
    50.01% { opacity: 0; }
    100% { opacity: 0; }
}
@-o-keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 1; }
    50.01% { opacity: 0; }
    100% { opacity: 0; }
}

/* 定义blink类 */
#register .blink {
    animation: blink .75s linear infinite;
    /* 其它浏览器兼容性前缀 */
    -webkit-animation: blink .75s linear infinite;
    -moz-animation: blink .75s linear infinite;
    -ms-animation: blink .75s linear infinite;
    -o-animation: blink .75s linear infinite;
    color: red;
}
#register .activity{
    text-align: center;    color: red;
    font-weight: bold;
    height: 20px; line-height: 20px
}